Add test and update references

tests/errors/structs_11.py

@@ -0,0 +1,16 @@
+from lpython import dataclass, i32
+
+# test issue 2044
+
+@dataclass
+class Foo:
+    x : i32
+
+@dataclass
+class Bar:
+    foo : Foo = Foo()
+
+bar : Bar = Bar()
+
+print(bar.foo)
+print(bar)

tests/reference/llvm-structs_11-a746e1b.json

@@ -0,0 +1,13 @@
+{
+    "basename": "llvm-structs_11-a746e1b",
+    "cmd": "lpython --no-color --show-llvm {infile} -o {outfile}",
+    "infile": "tests/errors/structs_11.py",
+    "infile_hash": "9cb6c80ad837ba66472a91b22e9068ec439b6a2a179a452d90d84c78",
+    "outfile": null,
+    "outfile_hash": null,
+    "stdout": null,
+    "stdout_hash": null,
+    "stderr": "llvm-structs_11-a746e1b.stderr",
+    "stderr_hash": "58e383d2ac915263088426f1b511760a8cb9ef3dd6f24cb207eda4de",
+    "returncode": 3
+}

tests/reference/llvm-structs_11-a746e1b.stderr

@@ -0,0 +1,5 @@
+code generation error: Printing support is not available for `Foo` type.
+  --> tests/errors/structs_11.py:16:1
+   |
+16 | print(bar)
+   | ^^^^^^^^^^ 

tests/tests.toml

@@ -687,6 +687,10 @@ asr = true
 filename = "errors/structs_10.py"
 asr = true
 
+[[test]]
+filename = "errors/structs_11.py"
+llvm = true
+
 [[test]]
 filename = "errors/const_01.py"
 asr = true